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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2023 Qualcomm Innovation Center, Inc. All rights reserved.
*/
#include <linux/amba/bus.h>
#include <linux/bitmap.h>
#include <linux/coresight.h>
#include <linux/coresight-pmu.h>
#include <linux/device.h>
#include <linux/err.h>
#include <linux/fs.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of.h>
#include "coresight-priv.h"
#include "coresight-tpdm.h"
DEFINE_CORESIGHT_DEVLIST(tpdm_devs, "tpdm");
/* TPDM enable operations */
static int tpdm_enable(struct coresight_device *csdev,
struct perf_event *event, u32 mode)
{
struct tpdm_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
spin_lock(&drvdata->spinlock);
if (drvdata->enable) {
spin_unlock(&drvdata->spinlock);
return -EBUSY;
}
drvdata->enable = true;
spin_unlock(&drvdata->spinlock);
dev_dbg(drvdata->dev, "TPDM tracing enabled\n");
return 0;
}
/* TPDM disable operations */
static void tpdm_disable(struct coresight_device *csdev,
struct perf_event *event)
{
struct tpdm_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
spin_lock(&drvdata->spinlock);
if (!drvdata->enable) {
spin_unlock(&drvdata->spinlock);
return;
}
drvdata->enable = false;
spin_unlock(&drvdata->spinlock);
dev_dbg(drvdata->dev, "TPDM tracing disabled\n");
}
static const struct coresight_ops_source tpdm_source_ops = {
.enable = tpdm_enable,
.disable = tpdm_disable,
};
static const struct coresight_ops tpdm_cs_ops = {
.source_ops = &tpdm_source_ops,
};
static int tpdm_probe(struct amba_device *adev, const struct amba_id *id)
{
void __iomem *base;
struct device *dev = &adev->dev;
struct coresight_platform_data *pdata;
struct tpdm_drvdata *drvdata;
struct coresight_desc desc = { 0 };
pdata = coresight_get_platform_data(dev);
if (IS_ERR(pdata))
return PTR_ERR(pdata);
adev->dev.platform_data = pdata;
/* driver data*/
drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
if (!drvdata)
return -ENOMEM;
drvdata->dev = &adev->dev;
dev_set_drvdata(dev, drvdata);
base = devm_ioremap_resource(dev, &adev->res);
if (IS_ERR(base))
return PTR_ERR(base);
drvdata->base = base;
/* Set up coresight component description */
desc.name = coresight_alloc_device_name(&tpdm_devs, dev);
if (!desc.name)
return -ENOMEM;
desc.type = CORESIGHT_DEV_TYPE_SOURCE;
desc.subtype.source_subtype = CORESIGHT_DEV_SUBTYPE_SOURCE_OTHERS;
desc.ops = &tpdm_cs_ops;
desc.pdata = adev->dev.platform_data;
desc.dev = &adev->dev;
desc.access = CSDEV_ACCESS_IOMEM(base);
drvdata->csdev = coresight_register(&desc);
if (IS_ERR(drvdata->csdev))
return PTR_ERR(drvdata->csdev);
spin_lock_init(&drvdata->spinlock);
/* Decrease pm refcount when probe is done.*/
pm_runtime_put(&adev->dev);
return 0;
}
static void __exit tpdm_remove(struct amba_device *adev)
{
struct tpdm_drvdata *drvdata = dev_get_drvdata(&adev->dev);
coresight_unregister(drvdata->csdev);
}
/*
* Different TPDM has different periph id.
* The difference is 0-7 bits' value. So ignore 0-7 bits.
*/
static struct amba_id tpdm_ids[] = {
{
.id = 0x000f0e00,
.mask = 0x000fff00,
},
{ 0, 0},
};
static struct amba_driver tpdm_driver = {
.drv = {
.name = "coresight-tpdm",
.owner = THIS_MODULE,
.suppress_bind_attrs = true,
},
.probe = tpdm_probe,
.id_table = tpdm_ids,
.remove = tpdm_remove,
};
module_amba_driver(tpdm_driver);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Trace, Profiling & Diagnostic Monitor driver");
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